Stool



FIG. 1 is a front perspective view of a stool illustrating my new design;

FIG. 2 is a top plan view of the stool shown in FIG. 1;

FIG. 3 is a side elevation view of the stool shown in FIG. 1;

FIG. 4 is a rear elevation view of the stool shown in FIG. 1;

FIG. 5 is a bottom plan view of the stool shown in FIG. 1.

The side of the stool not shown in FIG. 3 is a mirror image of the side shown. 

The ornamental design for a stool, substantially as shown and described. 